You may want to edit a paper and find only limited editing options appear for that paper. To check if your edit options appear, please go to your profile. If you're trying to edit papers of which you are a co-author of, your edit options may look like this.
What this means is that you are not the original uploader or person who approved the paper to be on the site. Because of this, you will not be able to edit the paper, including deleting it. If you would like to make any edits to the paper, including deleting it, you will have to contact the original uploader or claimer of the paper.
If there is a case where a paper appears to be claimed or originally uploaded by a person who is not the owner, please contact us and we'll see what further steps we can take to help you out.